[Mac] Fix for security indicator drag&drop navigation

chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm

Index: chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
index 3b227f8bdecad182ef65e690c9565ee36011aa79..2b68af5582a59bf47a20868dde4f9ca0e46d1596 100644
--- a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
+++ b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
@@ -513,12 +513,21 @@ const CGFloat kAnimationDuration = 0.2;
   // TODO(viettrungluu): crbug.com/30809 -- this is a hack since it steals focus
   // and doesn't return it.
   [[self window] makeFirstResponder:self];
-  return [dropHandler_ draggingEntered:sender];
+
+  bool canDropAtLocation =
+      [[self cell] canDropAtLocationInWindow:[sender draggingLocation]
+                                      ofView:self];
+  return canDropAtLocation ? [dropHandler_ draggingEntered:sender]
+                           : NSDragOperationNone;
 }
 
 // (URLDropTarget protocol)
 - (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)sender {
-  return [dropHandler_ draggingUpdated:sender];
+  bool canDropAtLocation =
+      [[self cell] canDropAtLocationInWindow:[sender draggingLocation]
+                                      ofView:self];
+  return canDropAtLocation ? [dropHandler_ draggingUpdated:sender]
+                           : NSDragOperationNone;
 }
 
 // (URLDropTarget protocol)